X m metal-boring machine



-(No Model.) r Y v 'D. W. PEDRIGK.v

METAL BORING MAGHN'E. f 10.255.449 Patented Mar. 28,1882;

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UNITED STATES PAT-,ENT (DFFICE.

DANIEL w. PnDnIcIr, oF PHILADELPHIA, PENNSYLVANIA.

METAL-'BORING MACHINE.

SPECIFICATION forming part of Letters Patent No. 255,449, dated March 28, 1882.

` Application filed December 20, 1881. (No model.)

Aand rotated in bearings secured removably to the ends of a cylinder, and receives aslow long'itudinal movement to impart the desired feed to the cutters by gearing operated by the ro tation of the boring-bar and connected to nut engaging thethread of a stationary feedscrew. Such a construction is exemplified in Letters Patent of the UnitedStatesNo.66,011, grantcdand issued to L. B. Flanders, under d ateof'June 25, 1867, upon which Iny invention is an improvement, its objects being to econo- Inize space andrender the apparatus self-contained by dispensing with an exterior support for thefeed-screw, and to enable the boringbar and cutters to bereadily moved into any desired position relatively to the feed-screw.

To these ends my improvements consist in the combination of a bearing-plate for the borin g-bar, adapted to be connected to one end of the cylinder which is to be bored, a bearing or thrust plate having acentral socket for the reception of the end ot' the feed-screw, and coupling rods having their ends secured to the bearing-platesoftheboring-barandfeed-screw, respectively.

My improvements further consist in the combination, with the boring-bar and feed-screw, of a sectional or divided nut pivoted to one of the gears by which longitudinal movement is impartedto the boring-bar, and a removable clamp by means of which said nut maybe made to engage with or be removed from l`'contact with the feed-screw, as desired.

The` improvements claimed are hereinafter more fully set forth.

In the accompanying drawings, Figure l is a longitudinal central section through an apparatus for boring cylinders embodying myinvention; Fig. 2, a face view of the bearingplate of the feed-screw; Fig. 3, an end view, on

clamped in position uponl the screw and connected to the gear by which it is rotated and Fig. 4, a4 side view, on a similar scale, ot' onesection of said nut. I

The boring-bar B, which is tubular for the major portion of its length, is supported and turns freely in sockets c, secured in the central openings of bearing-plates C, bolted to brackets C", which are in turn bolted to the flanges of the cylinder A, which is 'to be bored. A cutter-head, B', is secured Aupon the boringbar by a key, yb', fitting a longitudinal slot in the bar, and carries a series of adjustable cutters, b. Rotation is impart-ed to the bar by a gear, B2, secured thereon by akey, b2, said gear being by preference driven by a train of gearing mounted in bearings in a frame, B3, journaled upon the hub ofthe gear B2. The construction of said gearing'is, however, not material to my improvements, and need not therefore be herein specically. set forth.

A feedscrew, D, tits freely within the tubular portion of the boring-bar B, and is supported in a sleeve, c, projecting from one side of a frame or feed-casing, E, which carries `the bearings of the train of gearing by which the boring-bar ismoved longitudinally to effect the feed of the cutters. The outer end of the feed-screw D is fitted, so as tc prevent its rotation, inthe central socket ofa bearing or thrust plate, D', which is connected by coupling-rods d with the bearing-plate C of the adjacent end of the cylinder A.' Collars d' are formed upon the coupling-rods ol, against which the plates G and D bear, the portions of the rods exterior to said collars passing through slots in said plates and having threaded'ends and nuts d?, by which they are clamped to the plates. The sleeve c of the feed-casing is yprovided With a key or feather, which enters a longitudinal groove in the feed-screw, so as to prevent the rotation of the casing upon the screiyh while ,admitting of its longitudinal movement, andA the boring-bar is fitted to ro-k tate freely upon the outer surface of said sleeve as a journal. A gear,'b3, secured upon the outer end of the boring-bar, engages a gear, c', journaled upon the feed-casing, and the gear e in turn engages a gear, c2, upon a hollow IOO shaft, c?, fitted in bearings in said casing. The gear e2 may he made fast or loose upon the shalt e3, as desired, by means of a sliding stem, c4, fitting within the shalt, and having a transverse-pin which enters radial slots in the gear e2, the stem being held in its normal position to effect the coinciden-t rotation ofthe gear c2 and shaft e3 during the boring operation by a spring. A gear, c5, secured upon the shaft e3, engages a gear, e, which is journaled on the feed-easing concentrically with the feedscrewand boring-bar, and is rotated at a reduced rate of speed by and coincidently with the boring-bar through the gears b3, e', e2, and e5. The train ot' gear-wheels, as above described, is substantially similar in arrangement and operation t0 that of Letters Patent No. 66,011, before referred to, anddoes not per se constitutevpart of my invention.

A sectional or divided nut, F, composed et' t\vo sections, each having an internal thread coi responding with that of the feed-screw, is pivoted by boitsj'to the gear e6 in such relation tothe feed screw as that when the two sections are brought into contact and connected by a clampingnut,f, fitting an external thread on the sections, they form a complete nut, which engages the thread of the feedscrexv. inasmuch as the feed-screw is held stationary and the feed-easing is prevented from rotating upon it, the rotation ot the gear e and nut F moves the casing and boring-bar longitudinally upon the feed screw, thereby imparting the required feed to the cutters.

When it is desired to move the boring-bar backward to its original position, or to so adjust it that the cutter-head may stand in any desired position relatively to the bearing-plates of the boring-bar, the clamping-nut f' is removed and the sections of the nut F swung upon their pivots, so as to be clear of the feedscrew, when the boring-bar may be readily and speedily moved by hand to the required position, the delay which is involved in traversing the uut backward over the feed-screw, asin the construction heretofore employed, being ohviated. The sections of' the nut F are herein shown as separately pivoted to the gear e,- bnt, it' desired. one may be made to partially overlap the other, and asingie pivotcan in such case be employed.

By my improvements I provide an apparatus which is complete in itself and needs no support or bearing exterior to the cylinder which is to be operated upon, thus eeonomizing the space occupied and facilitating application under circumstances where the location of an eX- ternai bearing for the feed-screw is not conveniently practicable. It. will be seen, also, that economy of timeis effected and convenient operation promoted bythe means provided for admitting ot' the quick return of the boring-bar to position for commencing a. new out, or to any other desired position.

I claim as my invention and desire to secure by Letters Paten t 1. In an apparatus for boring cylinders,the combination, substantially as set forth, of a. bearing-plate having a central opening for the passage of a bo'ring-bar, a bearing or thrust plate having a central socket for the reception Ofafeed-screw,and coupling'rodsby which said plates are connected one with the other.

2. In an apparatus for boring cylinders,the Combination, substantially as set forth, ot' a boringbar, a feed-screiv concentric therewith, a gear njournaled upon a casing which is fitted to niovetvith the boring-bar longitudinally on the feed-screw without rotating with the boring-bar, a sectional or divided nut pivoted to said gear, and a clamp by which said nut may be made to either engage with or be removed from contact with the feed-screw.

DANIEL YV. PE DRIOK.

Witnesses:

J. SNOWDEN BELL, HARRY C. AYER. 

